<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
	<title>最大映射数量检查 | ElasticSearch 7.7 权威指南中文版</title>
	<meta name="keywords" content="ElasticSearch 权威指南中文版, elasticsearch 7, es7, 实时数据分析，实时数据检索" />
    <meta name="description" content="ElasticSearch 权威指南中文版, elasticsearch 7, es7, 实时数据分析，实时数据检索" />
    <!-- Give IE8 a fighting chance -->
    <!--[if lt IE 9]>
    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
	<link rel="stylesheet" type="text/css" href="../static/styles.css" />
	<script>
	var _link = '_maximum_map_count_check.html';
    </script>
</head>
<body>
<div class="main-container">
    <section id="content">
        <div class="content-wrapper">
            <section id="guide" lang="zh_cn">
                <div class="container">
                    <div class="row">
                        <div class="col-xs-12 col-sm-8 col-md-8 guide-section">
                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/_maximum_map_count_check.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/_maximum_map_count_check.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/_maximum_map_count_check.html" rel="nofollow" target="_blank">../en/_maximum_map_count_check.html</a></div>
                        <!-- start body -->
                  <div class="page_header">
<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
</div>
<div id="content">
<div class="breadcrumbs">
<span class="breadcrumb-link"><a href="index.html">Elasticsearch 权威指南 [7.7]</a></span>
»
<span class="breadcrumb-link"><a href="setup.html">安装和设置</a></span>
»
<span class="breadcrumb-link"><a href="bootstrap-checks.html">引导检查</a></span>
»
<span class="breadcrumb-node">最大映射数量检查</span>
</div>
<div class="navheader">
<span class="prev">
<a href="max-size-virtual-memory-check.html">« 最大虚拟内存检查</a>
</span>
<span class="next">
<a href="_client_jvm_check.html">客户端JVM检查 »</a>
</span>
</div>
<div class="section">
<div class="titlepage"><div><div>
<h2 class="title">
<a id="_maximum_map_count_check"></a>最大映射数量检查 (Maximum map count check)
</h2>
</div></div></div>
<p>
继续上个 <a class="xref" href="max-size-virtual-memory-check.html" title="Maximum size virtual memory check">知识点</a>，为了有效地使用 <code class="literal">mmap</code>，Elasticsearch 还需要创建许多内存映射区域的能力。

最大映射数量检查会检查内核是否允许一个进程拥有至少 262,144 个内存映射区域，并且仅在 Linux 上强制执行。

要通过最大映射数量检查，必须通过 <code class="literal">sysctl</code> 将 <code class="literal">vm.max_map_count</code> 至少配置为 <code class="literal">262144</code>。
</p>
<p>
或者，只有在使用 <code class="literal">mmapfs</code> 或 <code class="literal">hybridfs</code> 作为索引的<a class="xref" href="index-modules-store.html" title="Store">存储类型</a>时，才需要最大映射数量检查。

如果你 <a class="xref" href="index-modules-store.html#allow-mmap">不允许</a> 使用 <code class="literal">mmap</code> ，则不会强制执行此引导检查。
</p>
</div>
<div class="navfooter">
<span class="prev">
<a href="max-size-virtual-memory-check.html">« 最大虚拟内存检查</a>
</span>
<span class="next">
<a href="_client_jvm_check.html">客户端JVM检查 »</a>
</span>
</div>
</div>

                  <!-- end body -->
                        </div>
                        <div class="col-xs-12 col-sm-4 col-md-4" id="right_col">
                        
                        </div>
                    </div>
                </div>
            </section>
        </div>
    </section>
</div>
<script src="../static/cn.js"></script>
</body>
</html>